Mercutio says many rude things to the Nurse in Act 2 Scene 4. This shows that he does not think very highly of her, and assumes she is a servant or someone of low class. He believes he is above the law and free to taunt or torment anyone he wishes. He repeatedly calls the Nurse ugly and makes several more suggestive comments at her, showing no regard for her feeling or status because he does not think she matters.